How and where to use guide
VELUX Twin and Combination Flashings 134x140cm EKW UK08 0021E
Typical applications and suitability
These flashings are designed for sealing roof and wall openings on pitched roof constructions where tiles, slates, or similar roofing materials are used. They provide the critical weather barrier around openings up to 140cm in width. The product suits both new build installations and retrofit projects on timber-framed structures graded F16, F24, or F36. They are equally suitable for DIY projects and professional installations.
- Roof openings on pitched tile or slate roofs
- Wall openings requiring weather protection
- Openings up to 140cm wide
- Timber structures with grades F16, F24, or F36
- New build and retrofit applications
Installation and on-site guidance
Installation should be carried out on pitched roofs and vertical walls where the flashing can be properly integrated with the surrounding roofing material. The flashing must be positioned to direct water away from the opening and down the roof slope or wall surface. Ensure the timber frame is of the correct structural grade before installation. The UV-stabilised plastic finish requires no special preparation, though the installation surface should be clean and dry. Follow the specific installation instructions provided with the product to ensure the weather-tight seal is properly achieved.
- Install on clean, dry surfaces
- Position to direct water away from the opening
- Integrate with surrounding tiles, slates, or roofing materials
- Verify timber grade compatibility before fixing
- Follow manufacturer installation instructions for weather-tight performance
Durability and maintenance
The UV-stabilised plastic construction provides long-term resistance to weathering and UV degradation. The flashing requires minimal maintenance once installed. Periodically check that the seal remains intact and that debris has not accumulated around the flashing edges. The plastic finish will not require painting or coating. In areas of high exposure or severe weather, inspect the flashing annually to ensure the weather-tight seal has not been compromised.
- UV-stabilised plastic resists weathering and degradation
- Minimal maintenance required after installation
- Check seal integrity periodically
- Clear debris from flashing edges
- No painting or additional coating needed
Limitations and important notes
These flashings are designed specifically for openings up to 140cm wide. Larger openings will require alternative solutions. The product is compatible only with timber grades F16, F24, and F36; verify structural grade before installation. The flashing is designed for use with standard roofing materials such as tiles and slates; compatibility with other roofing systems should be confirmed. Installation on flat roofs or non-standard roof pitches may require additional measures to ensure proper water drainage.
- Maximum opening width 140cm
- Compatible with timber grades F16, F24, F36 only
- Designed for pitched roofs and vertical walls
- Intended for use with tiles, slates, and similar roofing materials
- Confirm compatibility with non-standard roofing systems